Bag opener component for plastic bag dispenser

ABSTRACT

A bag opener is presented as an accessory component for bag roll dispensers, which allows bags to be dispensed to the user in a partially opened state. The opener may be extruded, molded or machined depending on the design of the dispenser, and is suitable for multiple-ply bags (such as “star sealed” bags) that are dispensed from a continuous roll.)

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

Not applicable

FIELD OF THE INVENTION

This invention relates generally to devices that are designed to serially dispense plastic bags from a continuous roll, such as the type used for self-service produce, grocery or garbage bags. More specifically, this invention describes an accessory component that may be used to retrofit existing bag dispensers.

BACKGROUND OF THE INVENTION

Bag dispensers are ubiquitous throughout grocery stores and markets where produce and other items are displayed in bulk, and consumers select and bag their own merchandise for purchase. A common form of such dispensers utilizes rolls of bags, standardly referred to as “star-seal” bags, in which a tube of plastic is folded or gusseted to form multiple layers. The long tubes are welded laterally at uniform intervals to form individual bags. The bags are connected sequentially along perforated lines and wound onto a roll. A projection on the dispenser, hereinafter referred to as the tongue, engages a slot in the perforation line to separate a bag from the roll and hold the trailing bag in position for the next user.

A common complaint of users is that, once a bag has been removed, it is difficult to open. This is partially due to the bag material,-which has a tendency to build up a static charge causing the thin layers of plastic to adhere to each other. However, it is also a deficiency of current dispenser designs that they do not provide a means for separating the plies as the bags are dispensed.

Multiple dispenser designs have been disclosed in prior art that address a variety of issues related to the utility of bag dispenser devices. Simhaee (U.S. Pat. No. 5,135,146, U.S. Pat. No. 5,261,585, U.S. Pat. No. 5,433,363) describes various features to enable one-handed operation and prevent free-wheeling of the roll during operation. In later designs, Simhaee (U.S. Pat. No. 5,752,666) incorporates an additional mechanism which traps the leading edge of the next bag to prevent dispensing more than one bag at a time. Morris (U.S. Pat. No. 5,556,019) introduced a design that allows for operation when bags are pulled across the top or bottom of the tongue, and also incorporates a means of providing constant tension on the bags regardless of how many remain on the roll.

Kannankeril (U.S. Pat. No. 5,573,168) discloses a dispenser with a guide slot to ensure more reliable contact between the perforation and the tongue. The invention also discloses a “brush” as a frictional element to assist in opening the bags, however, this mechanism is integrated into an interior panel and is therefore limited to use with the described dispenser design. Kannankeril's design also differs from the present invention in that the frictional element engages the top ply of the bag rather than the bottom ply as disclosed in the present invention. Applying friction to the top ply, as Kannankeril describes, requires the user to pull upward on the bag in order to achieve adequate frictional force to seperate the bag plies. This design also applies friction prior to separation of the leading bag from the trailing bag. In order to separate the plies as a bag is dispensed, the frictional element must be positioned such that the friction is applied while the bags are being separated at the perforation line.

Daniels (U.S. Pat. Nos. 7,270,256 and 7,424,963) discloses a bag opening means that is also integrated into the dispenser and thus is limited to use with the described dispenser design. The bag opening means is also designed to facilitate opening of the leading bag as opposed to the trailing bag, as described in the present invention.

Other inventions specifically aimed at facilitating opening of bags as they are'dispensed address this issue by modifying the design of the bag itself. Simhaee (U.S. Pat. No. 6,135,281) describes a method of manufacturing a continuous strip of in which one or more Outer layers are separated entirely at the perforation line to facilitate easier separation of the bag from the roll. In another invention, Simhaee (U.S. Pat. No. 5,291,390) describes a bag design in which one ply does not contain a slit along the perforation line. The extra force required to detach this ply from the roll causes the plies to separate from each other. Campbell (U.S. Pat. No. 4,904,092) discloses the use of pressure sensitive adhesive on an outer surface of each bag which causes the front and back to separate when another is pulled from the roll or stack. Finally, Tan (U.S. Pat. No. 8,979,367) discloses features on the outer surface of the bags (either in a roll or in a stack) which releasably attach the rear wall of a first bag to the front wall of a second bag so that when the first bag is removed it causes the second bag to open before releasing. All of these solutions add extra cost to the individual bags, generating ongoing and unnecessary expense for the consumer.

In light of the foregoing discussion, it is an objective of the present invention to provide a means of dispensing plastic bags from a roll such that the bags are presented to the user in a partially opened state, without the need for specially modified bags.

Furthermore, it is an objective of the present invention to do so by providing an inexpensive accessory that can be easily retrofitted to a variety of existing plastic bag roll dispensers without the need for special tools or other apparatus.

SUMMARY OF THE INVENTION

The present invention describes a device that may be fitted to existing plastic bag dispensers in particular those that utilize rolls of bags standardly referred to as “star seal” such that the bags are dispensed in such a way that bags are presented to a user in a partially opened state. The device comprises a frictional top surface and a means of attachment to bag dispensers of various designs.

In a preferred embodiment, this device comprises a length of high-friction, pliable material that is extruded to conform to the top surface of a bag dispenser element, such material having sufficient coefficient of friction so as to exert adequate friction force against the bag to separate the plies, yet possessing adequate rigidity so as to be durable and robust.

In another embodiment, this device comprises a housing made of high-friction, pliable material that conforms to the top surface and encloses multiple sides of a bag dispenser element, such material having sufficient coefficient of friction so as to exert adequate friction force against the bag to separate the plies, yet possessing adequate rigidity so as to be durable and robust.

In another embodiment, this device comprises a length of high-friction, pliable material that is attached to a bag dispenser element by other mechanical means.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 illustrates typical construction of plastic bags that are dispensed from a continuous roll.

FIG. 2 illustrates a typical bag dispenser.

FIGS. 3a, 3b and 3c illustrate the operation of a common type of metal frame bag dispenser.

FIGS. 4a, 4b and 4c illustrate the operation of a common type of metal frame bag dispenser with a preferred embodiment of the present invention attached.

FIG. 5a is an exploded view of a preferred embodiment of the present invention and the dispenser component to which it attaches.

FIG. 5b is a cross-sectional view of a preferred embodiment of the present invention.

FIG. 6 is an exploded view of another embodiment of the present invention and the dispenser components to which it attaches.

FIG. 7 is an exploded view of a mechanical adapter that enables the present invention to attach to other types of dispensers.

FIG. 8 illustrates another embodiment of the present invention attached to a typical metal frame bag dispenser using a mechanical fastener.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 1-8, the bag opener component of the present invention includes a friction element and a means of mounting to an existing bag roll dispenser in such a way as to enable bags to be presented in a partially opened state.

FIG. 1 illustrates a typical bag design of the type standardly referred to as “star seal.” The bag 100 is formed from a tube of thin film plastic that is folded or gusseted creating multiple bag plies. Each bag is welded at one end 101 to form the bag bottom and releasably attached to the next bag by means of a perforation line 102. A slot 103 in the perforation line provides an opening to facilitate separation. A continuous strip of bags is wound on a roll for dispensing in a bag dispenser.

FIG. 2 is a functional illustration of a typical bag dispenser 200 for a roll of bags 201 constructed as described above. As a single bag 202 is dispensed, a tongue 203 engages a slot 103 in the perforation line between the bag being dispensed 202 and the trailing bag 205. A finger 204 creates a gap 206 which traps the leading edge of the trailing bag 205 and holds it in position for the next user.

FIGS. 3a, 3b, and 3c , illustrate this action in greater detail for multi-ply bags that would be typical of a star-seal design. As shown in FIG. 3a , as the leading bag 302 is being dispensed, it rides smoothly along the top of the tongue 303. When the tongue 303 engages the slot 103 in the perforation line between the leading bag 302 and the trailing bag 305, as illustrated in FIG. 3b , it limits further travel of the trailing bag 305 and facilitates separation of the two bags along the perforation line. As shown in FIG. 3c , as the bags are being separated, the leading edge of the trailing bag 305 is pulled into the gap 306 that is formed between the tongue 303 and the finger 304. Due to the fact that the finger 304 is a smooth surface, the trailing bag 305 rides smoothly over the surface and the bag plies do not separate.

FIGS. 4a, 4b and 4c illustrate this same action with the bag opener component 406 of the present invention attached to the finger 404 of a typical dispenser. As shown in FIG. 4a , as the leading bag 402 is being dispensed, it rides smoothly along the top of the tongue. When the tongue engages the slot 103 in the perforation line between the leading bag 402 and the trailing bag 405, as illustrated in FIG. 4b , it limits further travel of the trailing bag 405 and facilitates separation of the two bags along the perforation line. However, in this case, the trailing bag 405 encounters the frictional surface of the bag opener 406 of the present invention. As shown in FIG. 4c , as the bags are being separated, and the leading edge of the trailing bag 405 is pulled into the gap 407 that is formed between the tongue 403 and the finger 404, friction applied against the bottom ply of the trailing bag 405 causes the plies to separate, leaving the trailing bag 405 in a partially opened state for the next user.

FIG. 5a is an exploded view of a preferred embodiment of the present invention designed for use on dispensers having a finger 502 that is open on both sides, such as a metal frame bag dispenser. The bag opener component 501 is constructed as a single piece by the extrusion method. The material is selected to provide adequate frictional force to separate the lower bag ply from the upper bag plies. The material must be sufficiently pliable to conform to the finger element of the dispenser, while having adequate wall strength to hold it securely in position. Materials that possess suitable coefficient of friction include but are not limited to silicone, natural rubber, polyethylene and polyurethane.

As shown in FIG. 5b the top surface 503 of the bag opener component 501 may incorporate a series of ridges, grooves or other protuberances to enhance the friction characteristics required to separate the lower bag ply from the upper bag plies. The dimensions of the aperture 504 formed by two flanges 505 located on opposite sides of the bag opener component 501 is determined by the width and thickness of the finger 502 material. The pliability of the component material allows the bag opener component 501 to be stretched over the top surface of the finger 502. The flanges 505 serve to hold the bag opener 501 securely in place.

FIG. 6 is an exploded view of another embodiment of the present invention designed for use on dispensers having a finger 602 that is closed on all sides, such as a bag dispenser that is constructed from a material such as polymethyl methacrylate. In this case, the bag opener component 601 consists of a flexible or semi-rigid housing 603 made from a material having a sufficient coefficient of friction to provide adequate frictional force to separate the lower bag ply from the upper bag plies. The housing 603 may be constructed from a variety of materials using injection molding techniques or by gluing/bonding of individual pieces. A non-uniform outer surface 604 may incorporate a series of grooves, ridges or other protuberances to enhance the friction characteristics required to separate the lower bag ply from the upper bag plies. During the manufacturing process, various dimensions and angles of the housing 603 can be adjusted to accommodate the dimensions of specific dispenser fingers 602. The bag opener component housing 603 is illustrated here to comprise a top surface and three sides, which is generally adequate as the force applied when a bag is dispensed will always be toward the tongue, serving to retain the bag opener component in place. Alternatively, the housing 603 may be designed to comprise a top surface and four sides to slide over the dispenser finger 602, provided that it is designed in such a way that the fourth side, being the front surface, does not impede the trailing bag from being captured in the gap between the dispenser finger 602 and the dispenser tongue 605.

FIG. 7 illustrates another embodiment of the present invention which enables a bag opener component 701 to be adapted for use on bag roll dispensers having no finger. An adaptor 702 comprises a piece of stamped sheet metal (such as steel or other material with adequate mechanical strength) which is fabricated to create the necessary gap 705 behind the tongue 704 to hold the trailing bag in place as a bag is dispensed. A slot 703 in the adaptor slides over the tongue 704. A bag opener can then be attached to the adaptor 702 to function as previously described in FIGS. 5a and 5 b.

FIG. 8 illustrates yet another embodiment of the present invention in which the bag opener component 801 is designed to be attached to a dispenser have a finger 802 that is open on both sides using a mechanical fastener such as a clip or cable tie 803. The bag opener component 801 may be tubular, as shown, or rectangular in cross-section, and fabricated from a material having a sufficient coefficient of friction to provide adequate frictional force to separate the bag plies. Materials that possess suitable coefficient of friction include but are not limited to silicone, natural rubber, polyethylene and polyurethane. A non-uniform outer surface 804 may incorporate a series of grooves, ridges or other protuberances to enhance the friction characteristics required to separate the lower bag ply from the upper bag plies. This application allows for greater flexibility and reduces the need for customization.

As described herein, the present invention provides an accessory and adaptor for existing bag roll dispensers that enables plastic bags to be dispensed from a roll in a partially opened state.

The foregoing description was primarily directed to a preferred embodiment of the invention. It is anticipated that one skilled in the art will likely realize additional alternatives that are now apparent from disclosure of the embodiments of the invention. 

What is claimed:
 1. An accessory component for a bag roll dispenser useful in dispensing bags from a continuous roll in a partially opened state, comprising: a top having an outer surface, an inner surface, a first end and a second end; a first side extending generally orthogonal to the top inner surface proximate the top first end and having a first inner side surface and a first outer side surface; a second side extending generally orthogonal to the top inner surface proximate to the top second end and having a second inner side surface and second outer side surface; a first bottom flange extending generally orthogonal to the first side inner surface in a direction generally parallel to the top having a first bottom flange inner surface and first bottom flange outer surface and terminating at a first bottom flange and; a second bottom flange extending generally orthogonal to the second side inner surface in a direction generally parallel to the top surface having a second bottom inner flange surface and a second bottom outer flange surface and terminating at a second bottom flange and; wherein the first bottom flange and the second bottom flange extend in a direction generally toward one another; wherein an aperture is defined by the boundary of the first bottom flange and, the first flange inner surface, the first side inner surface, the top inner surface, the second side inner surface, the second bottom inner surface, the second bottom flange inner surface, and the second flange bottom end, and; wherein at least the top outer surface is constructed from a friction inducing material, whereby said friction inducing material provides sufficient resistance to the bottom ply of a multi ply bag in order to separate the plies as a bag is dispensed.
 2. The component of claim 1 wherein the aperture length, width and height is sized to fit over the finger of a bag dispenser apparatus, which finger is open on two sides.
 3. The component of claim I wherein the friction inducing material is one of silicone, rubber, polyethylene or polyurethane.
 4. The component of claim 1 wherein the entire component is comprised of friction creating material.
 5. The component of claim 4 wherein the friction inducing material is one of silicone, rubber, polyethylene or polyurethane.
 6. The component of claim 1 wherein the outer top surface includes grooves, ridges or other protuberances.
 7. An accessory component for a bag roll dispenser useful in dispensing bags from a continuous roll in a partially opened state, comprising: a top having an outer surface, an inner surface, a first end, a second end, and a back end; a first side extending generally orthogonal to the top inner surface proximate the top first end and having a first inner side surface and a first outer side surface; a second side extending generally orthogonal to the top inner surface proximate to the top second end and having a second inner side surface and second outer side surface; a third side extending generally orthogonal to the top inner surface proximate to the top back end and having a third inner side surface and third outer side surface; wherein a space is defined by the boundary of the first side inner surface, the top inner surface, the second side inner surface, and the third side inner surface, and; wherein at least the top outer surface is constructed from a friction inducing material, whereby said friction inducing material provides sufficient resistance to the bottom ply of a multi ply bag in order to separate the plies as a bag is dispensed.
 8. The component of claim 7 wherein the length, width and height of the defined space are sized to fit over the finger of a bag dispenser apparatus, which finger is closed on all sides.
 9. The component of claim 7 wherein the friction inducing material is one of silicone, rubber, polyethylene or polyurethane.
 10. The component of claim 7 wherein the entire component is comprised of friction inducing material.
 11. The component of claim 7 wherein the friction inducing material is one of silicone, rubber, polyethylene or polyurethane.
 12. The component of claim 7 wherein the outer top surface includes grooves, ridges or other protuberances.
 13. An accessory component for a bag roll dispenser useful in dispensing bags from a continuous roll in a partially opened state, comprising: a top having an outer surface, an inner surface, a first end, a second end, a back end, and a front end; a first side extending generally orthogonal to the top inner surface proximate the top first end and having a first inner side surface and a first outer side surface; a second side extending generally orthogonal to the top inner surface proximate to the top second end and having a second inner side surface and second outer side surface; a third side extending generally orthogonal to the top inner surface proximate to the top back end and having a third inner side surface and third outer side surface; a fourth side extending generally orthogonal to the top inner surface proximate to the top front end and having a fourth inner side surface and a fourth outer side surface; wherein a space is defined by the boundary of the first side inner surface, the top inner surface, the second side inner surface, the third side inner surface, and the fourth side inner surface, and; wherein at least the top outer surface is constructed from a friction inducing material, whereby said friction inducing material provides sufficient resistance to the bottom ply of a multi ply bag in order to separate the plies as a bag is dispensed.
 14. The component of claim 13 wherein the length, width and height of the defined space are sized to fit over the finger of a bag dispenser apparatus, which finger is closed on all sides.
 15. The component of claim 13 wherein the friction inducing material is one of silicone, rubber, polyethylene or polyurethane.
 16. The component of claim 13 wherein the entire component is comprised of friction inducing material.
 17. The component of claim 13 wherein the friction inducing material is one of silicone, rubber, polyethylene or polyurethane.
 18. The component of claim 13 wherein the outer top surface includes grooves, ridges or other protuberances.
 19. An adaptor for a bag roll dispenser, comprising: a slot for attaching to the existing tongue of an existing bag roll dispenser; an upwardly extending finger located upstream of the existing tongue which finger defines a gap to capture the leading edge of a second bag as a first bag is dispensed; a horizontal surface whereby the bag opener component of claim 1 may be attached. 